{"id":6395,"date":"2026-06-09T13:36:29","date_gmt":"2026-06-09T04:36:29","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/?post_type=route&p=6395"},"modified":"2026-09-30T13:36:41","modified_gmt":"2026-09-30T04:36:41","slug":"mcp-tools-not-visible-troubleshoot","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/6395\/","title":{"rendered":"MCP\u306eTools\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u539f\u56e0\uff5ctools\/list\u304b\u3089\u5207\u308a\u5206\u3051\u308b"},"content":{"rendered":"

MCP Server\u306b\u63a5\u7d9a\u3067\u304d\u3066\u3044\u308b\u306e\u306bTools\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u5834\u5408\u3001\u6700\u521d\u306b\u78ba\u8a8d\u3059\u308b\u306e\u306fTool\u5b9f\u884c\u3067\u306f\u306a\u304ftool discovery\u3067\u3059\u3002`tools\/list`\u304c\u4f55\u3092\u8fd4\u3057\u3066\u3044\u308b\u304b\u3092\u5883\u754c\u306b\u3059\u308b\u3068\u3001Server\u5074\u306e\u767b\u9332\u554f\u984c\u306a\u306e\u304b\u3001Host\u5074\u306e\u8868\u793a\u30fb\u8a31\u53ef\u554f\u984c\u306a\u306e\u304b\u3092\u5207\u308a\u5206\u3051\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u307e\u305a\u78ba\u8a8d\uff1a\u3069\u306e\u6bb5\u968e\u3067Tools\u304c\u6d88\u3048\u3066\u3044\u308b\u304b<\/h2>\n\n\n\n\n\n\n\n\n\n
\u89b3\u6e2c\u7d50\u679c<\/th>\n\u7591\u3046\u5834\u6240<\/th>\n\u6b21\u306e\u78ba\u8a8d<\/th>\n<\/tr>\n<\/thead>\n
Server\u3078\u63a5\u7d9a\u3067\u304d\u306a\u3044<\/td>\ntransport \/ initialize<\/td>\nstdio\u30fbHTTP\u30fb\u8a8d\u8a3c\u30fb\u8d77\u52d5\u30ed\u30b0<\/td>\n<\/tr>\n
tools\/list\u304c\u547c\u3079\u306a\u3044<\/td>\ncapability \/ protocol<\/td>\nServer\u304ctools capability\u3092\u5ba3\u8a00\u3057\u3066\u3044\u308b\u304b<\/td>\n<\/tr>\n
tools\/list\u304c\u7a7a<\/td>\nServer registration \/ authorization<\/td>\nTool\u767b\u9332\u72b6\u614b\u30fb\u8a8d\u53efscope<\/td>\n<\/tr>\n
tools\/list\u306b\u306f\u3042\u308b\u304cHost\u3067\u898b\u3048\u306a\u3044<\/td>\nHost\u8a2d\u5b9a<\/td>\n\u8a31\u53ef\u30fbfilter\u30fb\u63a5\u7d9a\u66f4\u65b0<\/td>\n<\/tr>\n
\u8868\u793a\u3055\u308c\u308b\u304c\u5b9f\u884c\u3067\u304d\u306a\u3044<\/td>\ntools\/call \/ input \/ authorization<\/td>\nTool\u540d\u30fbschema\u30fb\u6a29\u9650\u30fb\u5b9f\u884c\u30a8\u30e9\u30fc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u300c\u63a5\u7d9a\u3067\u304d\u305f\u300d\u3068\u300cTool\u3092\u767a\u898b\u3067\u304d\u305f\u300d\u306f\u5225\u306e\u6bb5\u968e\u3067\u3059\u3002\u307e\u305a`tools\/list`\u307e\u3067\u901a\u308b\u304b\u3092\u78ba\u8a8d\u3057\u3001\u305d\u306e\u7d50\u679c\u3092\u57fa\u6e96\u306bServer\u5074\u3068Host\u5074\u3092\u5206\u3051\u307e\u3059\u3002<\/p>\n

\n

1\uff1aServer\u304ctools capability\u3092\u516c\u958b\u3057\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b<\/h2>\n

MCP 2026-07-28\u4ed5\u69d8\u3067\u306f\u3001Tools\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308bServer\u306f`tools` capability\u3092\u5ba3\u8a00\u3057\u3001Client\u304b\u3089\u306e`tools\/list`\u3078\u73fe\u5728\u5229\u7528\u53ef\u80fd\u306aTool\u96c6\u5408\u3092\u8fd4\u3057\u307e\u3059\u3002Tool\u6a5f\u80fd\u81ea\u4f53\u3092\u516c\u958b\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3001Host\u5074\u306e\u518d\u8aad\u307f\u8fbc\u307f\u3060\u3051\u3067\u306f\u89e3\u6c7a\u3057\u307e\u305b\u3093\u3002<\/p>\n

{\r\n  "capabilities": {\r\n    "tools": {\r\n      "listChanged": true\r\n    }\r\n  }\r\n}<\/code><\/pre>\n
\n
\u7528\u8a9e\u89e3\u8aac\uff1atools\/list<\/strong>
MCP Client\u304cServer\u306b\u5bfe\u3057\u3066\u5229\u7528\u53ef\u80fd\u306aTool\u4e00\u89a7\u3092\u554f\u3044\u5408\u308f\u305b\u308bprotocol request\u3067\u3059\u3002\u8868\u793a\u3055\u308c\u308bTool\u306e\u540d\u524d\u30fb\u8aac\u660e\u30fbinput schema\u306a\u3069\u306e\u767a\u898b\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<\/blockquote>\n
\uff08MCP Server\u305d\u306e\u3082\u306e\u306e\u5f79\u5272\u304b\u3089\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306b\u3064\u3044\u3066\u306f\u300eMCP\u30b5\u30fc\u30d0\u30fc\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u3068\u4f7f\u3044\u65b9<\/a>\u300f\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09<\/p>\n
\n
2\uff1atools\/list\u306e\u8fd4\u308a\u5024\u3092\u76f4\u63a5\u78ba\u8a8d\u3059\u308b<\/h2>\n
Client\u3092\u81ea\u4f5c\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001Host\u753b\u9762\u3092\u898b\u308b\u524d\u306b`listTools()`\u306e\u7d50\u679c\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002TypeScript SDK v2\u3067\u306f\u3001`listTools()`\u304c\u63a5\u7d9a\u5148Server\u306eadvertise\u3059\u308bTools\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n
const { tools } = await client.listTools();\r\n\r\nfor (const tool of tools) {\r\n  console.log(tool.name, tool.description);\r\n}<\/code><\/pre>\n
\u3053\u3053\u3067Tools\u304c\u8fd4\u308c\u3070\u3001Server\u304b\u3089Client\u307e\u3067\u306ediscovery\u306f\u6210\u7acb\u3057\u3066\u3044\u307e\u3059\u30020\u4ef6\u306a\u3089Server\u306eTool\u767b\u9332\u3068\u8a8d\u53ef\u6761\u4ef6\u3078\u9032\u307f\u307e\u3059\u3002<\/p>\n
\n
3\uff1a\u7a7a\u914d\u5217\u306a\u3089Tool\u767b\u9332\u3068authorization\u3092\u5207\u308a\u5206\u3051\u308b<\/h2>\n
\u73fe\u884cMCP\u4ed5\u69d8\u3067\u306f\u3001`tools\/list`\u304c\u8fd4\u3059\u96c6\u5408\u306f\u7a7a\u3067\u3082\u6210\u7acb\u3057\u307e\u3059\u3002\u307e\u305f\u3001request\u306b\u4ed8\u3044\u305fauthorization\u306b\u3088\u3063\u3066\u5229\u7528\u53ef\u80fd\u306aTool\u96c6\u5408\u304c\u5909\u308f\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u300c\u7a7a\uff1d\u901a\u4fe1\u5931\u6557\u300d\u3068\u6c7a\u3081\u3064\u3051\u305a\u3001Server\u304cTool\u3092\u767b\u9332\u3057\u3066\u3044\u308b\u304b\u3001\u73fe\u5728\u306e\u8a8d\u53ef\u3067\u305d\u306eTool\u3092\u516c\u958b\u3059\u308b\u8a2d\u8a08\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n
    \n
  • Server\u8d77\u52d5\u6642\u306bTool\u767b\u9332\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u304b<\/li>\n
  • \u767b\u9332\u3057\u305fTool\u304cdisabled\u72b6\u614b\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b<\/li>\n
  • Client\u304c\u60f3\u5b9a\u3057\u305fServer\/\u74b0\u5883\u3078\u63a5\u7d9a\u3057\u3066\u3044\u308b\u304b<\/li>\n
  • \u73fe\u5728\u306ecredential\u3084scope\u3067Tool\u304c\u516c\u958b\u5bfe\u8c61\u306b\u306a\u3063\u3066\u3044\u308b\u304b<\/li>\n<\/ul>\n
    TypeScript SDK\u306eServer\u5b9f\u88c5\u3067\u306f\u3001\u767b\u9332\u6e08\u307f\u3067\u6709\u52b9\u306aTool\u3092`tools\/list`\u3078\u7d44\u307f\u7acb\u3066\u307e\u3059\u3002Tool\u306e\u5b9f\u88c5\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3059\u308b\u3060\u3051\u3067\u306f\u4e00\u89a7\u3078\u51fa\u306a\u3044\u306e\u3067\u3001\u5b9f\u969b\u306eregister\u51e6\u7406\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n
    4\uff1aTools\u304c\u8fd4\u308b\u306e\u306bHost\u3067\u898b\u3048\u306a\u3044\u306a\u3089Host\u5074\u3078\u79fb\u308b<\/h2>\n
    `tools\/list`\u3067\u76ee\u7684\u306eTool\u304c\u8fd4\u3063\u3066\u3044\u308b\u306a\u3089\u3001protocol\u4e0a\u306ediscovery\u3068Host\u3067\u30e2\u30c7\u30eb\u3078\u516c\u958b\u3055\u308c\u308b\u7bc4\u56f2\u3092\u5206\u3051\u3066\u8003\u3048\u307e\u3059\u3002Host\u88fd\u54c1\u306b\u3088\u3063\u3066\u8a2d\u5b9a\u540d\u3084UI\u306f\u7570\u306a\u308b\u305f\u3081\u3001\u5171\u901a\u3057\u3066\u78ba\u8a8d\u3067\u304d\u308b\u306e\u306f\u300c\u63a5\u7d9a\u3092\u518d\u8aad\u8fbc\u3057\u305f\u304b\u300d\u300c\u305d\u306eServer\/Tool\u304c\u5229\u7528\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u304b\u300d\u300cTool filter\u3084policy\u3067\u9664\u5916\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u300d\u3067\u3059\u3002<\/p>\n
      \n
    • MCP\u63a5\u7d9a\u3092\u5207\u308a\u66ff\u3048\u305f\u5f8c\u306bHost\u304cTool\u4e00\u89a7\u3092\u518d\u53d6\u5f97\u3057\u3066\u3044\u308b\u304b<\/li>\n
    • \u63a5\u7d9a\u5148Server\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u304b<\/li>\n
    • Host\u307e\u305f\u306f\u7d44\u7e54policy\u3067Tool\u304c\u975e\u8868\u793a\u30fb\u7121\u52b9\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u304b<\/li>\n
    • \u5225Environment\u3084\u5225Profile\u3092\u898b\u3066\u3044\u306a\u3044\u304b<\/li>\n<\/ul>\n
      \u3053\u3053\u306fMCP core protocol\u3067\u306f\u306a\u304fHost\u5b9f\u88c5\u306e\u9818\u57df\u3067\u3059\u3002\u7279\u5b9aHost\u306e\u8a2d\u5b9a\u540d\u3092\u5225\u88fd\u54c1\u3078\u305d\u306e\u307e\u307e\u5f53\u3066\u306f\u3081\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n
      5\uff1aTool\u3092\u8ffd\u52a0\u30fb\u5909\u66f4\u3057\u305f\u76f4\u5f8c\u306flistChanged\u3068\u518d\u53d6\u5f97\u3092\u78ba\u8a8d\u3059\u308b<\/h2>\n
      Server\u306eTool\u96c6\u5408\u304c\u5909\u5316\u3059\u308b\u69cb\u6210\u3067\u306f\u3001`listChanged`\u5bfe\u5fdc\u3092\u4f7f\u3063\u3066Client\u3078\u5909\u66f4\u3092\u901a\u77e5\u3067\u304d\u307e\u3059\u3002\u901a\u77e5\u3092\u5229\u7528\u3057\u306a\u3044Host\u3084\u63a5\u7d9a\u3067\u306f\u3001\u518d\u63a5\u7d9a\u30fb\u518d\u8aad\u8fbc\u5f8c\u306b`tools\/list`\u3092\u53d6\u308a\u76f4\u3057\u3001\u53e4\u3044\u4e00\u89a7\u3092\u898b\u7d9a\u3051\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n
      Tool\u540d\u3092\u5909\u3048\u305f\u3001\u6761\u4ef6\u4ed8\u304d\u3067Tool\u3092\u767b\u9332\u3057\u305f\u3001\u8a8d\u53efscope\u3092\u5909\u3048\u305f\u3001\u3068\u3044\u3063\u305f\u5909\u66f4\u76f4\u5f8c\u306f\u3001Server\u30ed\u30b0\u3068Client\u5074\u306e\u53d6\u5f97\u7d50\u679c\u3092\u540c\u3058\u6642\u70b9\u3067\u6bd4\u8f03\u3059\u308b\u3068\u539f\u56e0\u3092\u8ffd\u3044\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
      6\uff1a\u4e00\u89a7\u306b\u51fa\u305f\u5f8c\u306e\u5931\u6557\u306ftools\/call\u5074\u3068\u3057\u3066\u8abf\u3079\u308b<\/h2>\n
      Tool\u304c\u4e00\u89a7\u306b\u51fa\u308b\u306e\u306b\u5b9f\u884c\u6642\u3060\u3051\u5931\u6557\u3059\u308b\u5834\u5408\u306f\u3001discovery\u554f\u984c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Tool\u540d\u3001input schema\u3001argument\u3001authorization\u3001Server\u5074\u51e6\u7406\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002TypeScript SDK\u3067\u306f`callTool()`\u3067Tool\u3092\u540d\u524d\u6307\u5b9a\u3057\u3066\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n
      const result = await client.callTool({\r\n  name: "lookup-order",\r\n  arguments: { id: "A-1041" }\r\n});\r\n\r\nconsole.log(result.isError, result.content);<\/code><\/pre>\n
      \u3053\u306e\u6bb5\u968e\u3092`tools\/list`\u554f\u984c\u3068\u6df7\u305c\u306a\u3044\u3053\u3068\u3067\u3001Server\u8d77\u52d5\u3084Host\u8a2d\u5b9a\u3092\u4f55\u5ea6\u3082\u3084\u308a\u76f4\u3059\u7121\u99c4\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002<\/p>\n
      \u78ba\u8a8d\u9806\uff1aconnection\u304b\u3089tools\/call\u307e\u30671\u6bb5\u305a\u3064\u9032\u3081\u308b<\/h2>\n
        \n
      • Server\u304c\u8d77\u52d5\u3057Client\u3068initialize\u3067\u304d\u3066\u3044\u308b\u304b<\/li>\n
      • Server\u304ctools capability\u3092\u5ba3\u8a00\u3057\u3066\u3044\u308b\u304b<\/li>\n
      • tools\/list\u306e\u7d50\u679c\u306b\u76ee\u7684\u306eTool\u304c\u542b\u307e\u308c\u308b\u304b<\/li>\n
      • \u7a7a\u306a\u3089Tool\u767b\u9332\u30fbenabled\u72b6\u614b\u30fbauthorization\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n
      • \u4e00\u89a7\u306b\u3042\u308b\u306e\u306b\u898b\u3048\u306a\u3044\u306a\u3089Host\u5074\u306e\u8a31\u53ef\u30fbfilter\u30fb\u518d\u8aad\u8fbc\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n
      • \u4e00\u89a7\u306b\u3042\u308a\u5b9f\u884c\u3060\u3051\u5931\u6557\u3059\u308b\u306a\u3089tools\/call\u30fbschema\u30fb\u6a29\u9650\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<\/ul>\n
        \u91cd\u8981\u306a\u306e\u306f\u3001\u753b\u9762\u306b\u51fa\u306a\u3044\u3068\u3044\u3046\u75c7\u72b6\u3060\u3051\u3067Server\u30fbClient\u30fbHost\u3092\u540c\u6642\u306b\u5909\u66f4\u3057\u306a\u3044\u3053\u3068\u3067\u3059\u3002`tools\/list`\u3092\u89b3\u6e2c\u70b9\u306b\u3059\u308b\u3068\u3001\u5909\u66f4\u7b87\u6240\u3092\u7d5e\u3063\u305f\u307e\u307e\u691c\u8a3c\u3067\u304d\u307e\u3059\u3002<\/p>\n
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